Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e33eff01261fbd…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 23:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: bceac7abda47221e9c4b317db6d19a52 SHA-1: ad6ad3bc9e99e24f4b86cdb28393a70e11f7a428 SHA-256: 53e33eff01261fbdd34724a275d3525260c528bbe48f22e6878e278987a57ce9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/award?keyword=english+grammar+book+class+2+pdf PDF link annotation
    • http://manudagubik.22web.org/80391811583.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/duximifizep.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/glencoe_chemistry_matter_and_change_download.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/poputapoz.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/cGjjiig/75819578204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486034/normal_6002e6cdb690d.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/PrifhbC/regal_theaters_cda_idaho.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/29200971845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_601f85fe29089.pdfIn PDF document text
    • http://nujerizura.iblogger.org/7401634567.pdfIn PDF document text
    • https://cdn.sqhk.co/dudazume/igggjha/kumevapes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5fe74e796ffbe.pdfIn PDF document text
    • https://cdn.sqhk.co/xomorenut/5rhghc7/tijajikupura.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/hdQQbsb/4228408021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_99e15e78c32348129aa1f479f42e93b7.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_d9c8f3fd1266472ab2e680cbb6e86e55.pdf?index=trueIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_aee44592034a4d12acaef279fd28f96d.pdf?index=trueIn PDF document text
    • http://wupukilazoko.rf.gd/arquetipos_inconsciente_colectivo_jung.pdfIn PDF document text
    • http://wupubobetob.epizy.com/differential_diagnosis_of_neonatal_sepsis.pdfIn PDF document text
    • http://kusogit.rf.gd/autopsy_of_jane_doe.pdfIn PDF document text
    • http://kirawolus.rf.gd/10264938455.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 5864 bytes
SHA-256: e1cff6f4bc2cce4bab1de21b606be8ede1cbb7852ae8160ae11bab1ffb838b85
font_01_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 10948 bytes
SHA-256: 4db11aef73e767b45bbf5abf46e6107db8037ca97f8b37ff551455f43428a93b

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